/**
	An example illustrating the implementation of a client in the
	<A HREF="http://www.speech.kth.se/proj/broker/>Broker architecture</A>.
	
	This client calls a server which adds integers.
	*/

import SE.kth.speech.broker.*;
import java.net.UnknownHostException;
import java.io.IOException;


public class AdderClient
{
	// This is a stand-alone Java program
	
	// It takes as arguments the host and port that the broker is running on, and
	// three integers. It prints the sums of the integers.
	
	// It never terminates.
	public static void main( String[] args )
	{
		BrokerClient brokerClient = null;
				
		if( args.length != 5 )
		{
			System.err.println("Five arguments: <brokerHost> <brokerPort> " +
												 "<number 1> <number 2> <number 3>");
			System.exit(-1);
		}
		
		// plenty of things can go wrong...
		try	
		{	
			brokerClient = new BrokerClient( "AdderClient", args[0], 
																			 Integer.parseInt( args[1] ) );
			brokerClient.connect();
		}
		catch( ServerDownException e )
		{
			System.err.println("Either the network is down, or there is no " +
												 "broker running on the specified host and port" );
			System.exit(-1);
		}
		catch( NumberFormatException e )
		{
			System.err.println("One of the specified numbers was not considered " +
												 "by Java to be a number." );
			System.exit(-1);
		}	
		catch( IOException e )
		{
			System.err.println("An I/O error occurred: " + e.getMessage() );
			System.exit(-1);
		}
		
		// do the actual function call 
		
		try
		{
			Object result;
			
			result = brokerClient.callFunc( "Adder", "add " + args[2] + " " + 
																			args[3] + " " + args[4] );
			
			if( !(result instanceof String ) )
				System.err.println("Expected a string returned from the adder?");
			else
				System.out.println("The sum is: " + ((String) result) );
		}
		catch( BrokerException e )
		{
			System.err.println("There was an error adding the numbers: '" + 
												 e.getMessage() + "'" );
			
			brokerClient.disconnect();
			System.exit(-1);
		}

		// Shut down the connection cleanly
		brokerClient.disconnect();
	}
}